Machine for turning bobbins.



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N. H. SHAWI MACHINE FOR TURNING BOBBINS.

APPLICATION FILED MAR. 1, 1909,

LQQgQLQM Patented Feb. 25, 1913.

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@3 62M/ @M M N. H. SHAW.

MACHINE FOR TURNING BOBBINS.

APPLIGATION FILED MAR. 1, 1909.

Patented Feb. 25, 1913.

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UNITED STATES PATENT OFFICE.

NATHANIEL H. SHAW, F BOSTON, MASSACHUSETTS.

MACHINE FOR 'TURNING BOBBINS.

To all 'whom t may concern.'

Be it known that. I, NATHANIEL H. SHAW, av citizen of the United States,residing at Boston, county of Suffolk, and State of Massachusetts, haveinvented an Improvement in Machines for Turning Bobbins, of which thefollowing description, in connection with the accompanying drawing, is aspecification, like letters on the drawing representing like parts.

This invention relates to a machine for shaping' roughly bobbinsfromwood stock and is in the nature of an improvement on the machine shownand described in my Patent No. 740,191, September 29, 1903.

The machine shown in this application is similar to that shown in Inyabove-mentioned patent in that it comprises a swinging knife, means tohold and rotate stock, means to swing the knife into position to act onthe stock and shape a bobbin therefrom, and means to feed the stock fromwhich the bobbins are made to the centers where each is automaticallygripped in turn and acted on by the knife.

Referring to the drawings wherein I have shown an embodiment of myinvention, Figure 1 is a front. view thereof; Fig. 2 is a top plan View;Fig. 3 is a detail of a portion of the knife; Fig. 4 is a section on theline Fig. 1; Fig. 5 is a detail view of the cam for operating thestock-feeding device;

Fig. 6 is a detail of the mechanism for operating the movable center;Fig. T shows the fixed center.

The operative parts of the machine are supported on a frame 3 which maybe of any suitable or usual construction. The blank 4 of wood stock tobe turned into a bobbin is sustained by two centers and 6. The center 5is mounted in a head 7 which is provided with teeth 3 that are adaptedto engage the end of the blank 4, as shown in dotted lines Fig. 7,thereby to rotate the blank. The center 5 is yieldingly sustained in thehead 7 said center being mounted to slide in said head and being actedon by a spring 9 that tends to project it into the full line positionFig. 7. The head 7 is positively driven by means of a driving pulley 10which is suitably sustained in bearings in the head stock of the lathe.The other or dead center comprises a brad center 6 and a Specificationof Letters Patent.

Application filed March 1, 1909. Serial No. 480,713.

Patented Feb. 25, 1913.

that extendsthrough .a sleeve 12 that is slidably mounted in bearings 13and 14 on the tail stock. The main center which supports the stock Whileit is being turned acts also as a driver to force the stock onto theteeth 8 of the chuck 7, as will be presently described.

The end of the rod 11 projects beyond the sleeve 12, as at 16, andconnected to said projecting end 1G is an arm 17 -to which is connecteda rod 1S extending parallel to the rod 11 and slidable through openingsformed in the uprights of the tail stock. Said rod 18 has thereon aprojection 19 that is adapted to be engaged by a spiral cam 20 fast on ashort shaft 21, one end of which is centered in thc upright 13 and theother end of which is sustained by a pointed screw 23 carried by theupright 14. A. tension spring 25 surrounding the rod 18 tends to keepthe rod and consequently the brad center G in its position toward theleft Figs. 1 and 2. As the vspiral cam 20 rotates it engages theprojection 19 and withdraws the center 6 as will be obvious. The tube orsleeve 12 has fast thereto a stud carrying a roll 26 which plays betweentwo guide members 27 and also has fast thereto another stud carrying aroll 28 that is situated to be acted on by the spiral cam 20. Situatedwithin the tube 12 is a spring 29 one end of which engages an interiorshoulder 30 formed in the tube and the other end of which engages a head31 situated within said tube. Said head 31 is carried by ascrew-threaded stem 32 which is screw-threaded through the end 33 of acylinder 34 that is rigidly secured to the bearing 14. rThis mayconveniently be done by screw-threading the cylinder 34 onto the hub ofthe sleeve or bushing which is rigidly carried by the bearing. The endof the tube 12 is provided with a piston head36 that tits the interiorof t-he cylinder 34,- and said cylinder 34 has a vent opening 37. Thespring 29 tends normally to force t-he tube 12 and the center 15 to theleft Fig. 6, and into engagement with t-he stock 4, and the dashpotconstruction comprising the cylinder 34 and piston 36 serves as a.cushion device to cushion the action of the spring in oase a.

blank 4 should not be located between the centers as will be more fullyhereinafter described.

The pieces of stock 4 are fed into position between the centersautomatically by means of a stock-carrier 40 which has a constructionsimilar to that shown in my beforementioned patent. This carrier istrough shaped to receive the pieces of stock 4, as shown best in Fig. 4,and it is mounted on a support 41 which is pivoted at 43 to .a bracket42 sustained by the frame. 4This carrier 40 is moved toward and from thecenters as in my above-mentioned patent and at the time that it is movedinto position in alinement with the centers the spiral cam 2O acts towithdraw the dead center 6 to permit the block in the carrier to bepositioned between the centers, and as soon as the block is thuspositioned, the cam passes off from the projections 19, 28. U

The projections 19 and 28 are so positioned that the projection 19 firstpasses olf from the spiral cam 2O thereby permitting the center 6 to beprojected into the end of the stock and thereafter the project-ion 28passes off from the spiral cam. As soon as this occurs, the spring 29,which has been compressed by the backward movement of the sleeve 12,operates to throw the said sleeve forwardly with a quick hammer-likeblow, thus bringing the center 15 into engagement with the stock 4 anddriving the stock toward the left into the dotted line position Fig. 7whereby the teeth 8 are embedded in the end of the stock, the livecenter 5 being carried backwardly into the dotted line position duringthis movement. The stock is then firmly held between the centers and isready to be operated on b v the knife. In case a piece of stock shouldfail to be presented to the centers the spring 29 will throw the sleeve12 forward until the piston head 36 passes by the vent opening 37 afterwhich the air still confined in the cylinder 34 will cushion themovement of the tube 12.

For moving the carrier 40 I have provided a mechanism which is adaptedto yield in case a piece of stock should get misplaced or get caught inthe way, and in this respect my invention differs from myabove-mentioned patent. The mechanism I have provided for this consistsof a rod connected to the upper end of the support 41 and having a head51 that plays in a tubular member 52. A spring 53 is confined in thetubular member between the head and one end. The tubular member issecured to a bracket 54 which has a slot 55 therein through whichextends a cam shaft 56 that acts as a guide for the bracket. A disk 57is mounted fast on the cam shaft and is provided with a pin orprojection 58 that is adapted to engage a vertically-extendingprojection 59 situated on the side of the bracket 54. As the diskrotates in the direction of the arrow Fig. 4, the projection 58 engagesthe vertical arm 59 and serves to force said arm and the bracket 54backwardly thus swinging the carrier int-o position in alinement withthe centers. The arm 59 has such a length that the pin 58 will pass 01Tfrom the bottom thereof at the time that the carrier is properly alinedwith the cent-ers, and as soon as this occurs a spring 60 comes intoplay to return the carrier to its initial position. If the carrier'should meet any obstruction on its movement toward the center thespring 53 will yield thus preventing any breakage of any of the parts. Ihave also provided for adjusting the length of the connection foroperating the swinging arm 41. As herein shown the rod 50 isscrew-threaded at one end, as at 111, and its other end hasscrew-threaded engagement wit-h the upper end of the arm 41, so that byapplying a wrench to the squared end of the rod 50, the length of theconnection can be adjusted.

110 is a stop nut which limits the expansive movement of the spring 53.

The knife for shaping the bobbins is shown at 61. It is carried by aswinging support 62 as in my former patent and is actuated by mechanismsimilar to that shown in the patent. The support 62 is shown as pivotedto the frame at 63 and has pivotally connected thereto a head 64 fromwhich extend two parallel rods 65'that play through a box 66 loose onthe cam shaft 56. A block 67 is also loosely mounted on these rods andis provided with a projection 670 that is adapted to be acted on by acam 68 mounted on the cam shaft 56. Springs 70 are placed around therods between the block 67 and the head 64, and other springs 69 surroundsaid rods and are situated between the box 66 and a cross piece 71carried by the rods. As the cam rotates it forces the block 67 towardthe left Fig. 4 thereby acting through the springs 70 to swing theknife-carrier into its operative position. lVhen the cam passes out fromunder the roll 670, the springs 69, and 70 restore the parts to theirnormal osition. The forward movement of the knifecarrier is limited byadjustable stops 7 3 that are carried' by suit-able arms 74. The camshaft 56 may be driven in any suitable way and I have herein shown it asprovided at one end with a gear 8O forming part of a set of adjustableor change gears 81 which operate similar to the corresponding gears ofan ordinary lathe. These gears 81 are driven from a step pulley 82 whichin turn is belted to a step pulley83 that receives its motion from thedriving pulley 10. The advantage of using change gearing is that thespeed of rotation of the cam shaft may be varied to suit thecircumstances under which the work is done. The spiral cam 20 may alsobe driven in any suitable way, but I have herein shown it as driven fromthe cam shaft 56. For this purpose said cam shaft has a gear 84 thereonwhich meshes with an intermediate gear that in turn meshes with anddrives a gear 86 rigid with the spiral cam.

90 is a positioning stop for positioning the stock in the 'carrier 40.This stop is adapted to engage the end ofthe stock but is moved out ofthe way when the stock is brought int-o alinement with the centers. Saidstop is shown as an arm formed on a rock-shaft 91 which is journaled inthe bracket 92 and which has an arm 93 that is-adapted to engage thehead 7 as the carrier swings forwardly. The engagement of the arm 93with the head 7 turns the rock-shaft to remove the stop 90 fromengagement with the end of the-stock thereby permitting the stop to haveits longitudinal movement necessary to be gripped between the centers. Aspring 94 tends to maintain the stop in normal position.

The knife I have herein shown is made removable so that any one of aplurality of diiierent shaped knives may be used. The knife is made withthe offset 'portion 95 which engages an adjusting screw 96 carried bythe knife frame. Said screw constitutes a backing for the offset portionof the knife and prevents said portion of the knife from springing awayfrom the beveled shoulder 120.

I have herein shown a novel way of adjustably mounting the carrier so asto permit it to be adjusted both vertically and' horizontally, and alsoso as to permit one end to be raised more or less. As herein shown theswinging support 41 has adjustably secured to its upper end an arm 101to which a plate 102 is bolted by meansof bolts or screws 103. The arms101 can be adjusted vertically on the swinging support and is held inadjusted position by the clamping screw 104. The plate 102 can beadjusted longitudinally on the arm and is held in adjusted position bythe bolts 103. T he carrier 40 comprises thc two wings 10T, 112 betweenwhich the stock 1 is sustained, and the wing 112 is pivoted on a rod 108sustained by the wing 107, a spring 109 serving normally to hold thewing 112 in proper position. The object of pivoting this wing 112 is topermit it to swing downwardly so as to clear the stock when the carrieris returned to normal position, all as shown and described in my formerpatent. @ne end of the wing 107 is pivoted to the plate 102 at 100, andthe other end of said wing is clamped to the plate by a bolt 105 whichpasses through a slot formed in the plate. The right hand end of thecarrier can thus he elevated or depressed as desired. This adjustment ofthe carrier adapts lthe machine to receive stock of different lengthsand sizes.

22 designates a rock shaft extending longitudinally of the bed of theframe and having a handle 100 at one end and an arm 2-1 at the othercarrying a binder pulley 99 which acts to tighten the belt connectingthe pulleys 82, 83.

Having fully described my invention, what I claim as new and desire tosecure by Letters Patent is 1. In a machine ,of the class described, thecombination with a spring-actuated and longitudinally-movable bradcenter and a slidably-mounted spring-actuated tube in which saidcenteris sustained, said tube having a main center to'engage the same end ofthe stock as that engaged by the brad center, of a` single cam to act onand withdraw both said centers against the action of their springs, saidcam releasing said centers successively. a

In a. machine of the class described, the combinationwith aspring-actuated and longitudinally-movable brad center, aslidablymounted spring-actuatedI member having a main center to strikeand sustain the same end of the stock as that engaged by the bradcenter, and means to feed pieces of stock separately to the centers, ofa spiral cam to withdraw both said brad center and said `spring-actuatedmember when each piece of stock is fed thereto said cam operating torelease the brad center first and then the main center.

3. In a machine of the class described, the combination with aspring-actuated and longitudinally-movable brad center, aslidablymounted spring-actuated member having a main center to strikeand sustain the end of the stock, means to feed pieces of stockseparately to the centers, and a knife to act on the stock, of a singlecam to withdraw both centers after the bobbin is finished said camoperating to release said centers successively.

4. In a machine of the class described, the combination with aspring-actuated and longitudinally-movable brad center and aslidably-mounted spring-actuated tube in which said center is sustained,said tube having a main center to engage and sustain the end of thestock, of a single cam to act on and withdraw each center, and a cushiondevice to limit the spring-impelled movement of said main center when apiece of stock is not fed to the machine.

5. In a machine of the class described, the combination with aspring-actuated and longitudinally-movable brad center, aslidablymounted spring-actuated member having a main center to strikeand sustain the end of the stock, and means to feed pieces of stockseparately to the centers, of a spiral cam to withdraw both said bradcenter and said spring-actuated member when each piece of stock is fedthereto, and a cushion device to limit the spring-impelled movement ofsaid main center when a piece of stock is not fed to the machine.

6. In a machine of the class described, the combination with aspring-actuated and longitudinally-movable brad center, of aslidably-mounted spring-actuated tube in which said center is sustained,said tube having a main center to engage and sustain stock and a pistonhead, a cylinder in whlch said plston head works, and means to retractboth the brad center and said tube to permit stock to be placed betweenthe centers, said cylinder acting to cushion the spring-impelledmovement of the tube.

7. In a machine of the class described, the combination with aslidably-mounted brad center, a spring-actuated rod parallel with saidcenter and connected thereto, and a projection on said rod,-of aslidably-mounted tube in which said brad center is received, a maincenter sustained by said tube, a projection on the tube, and a spiralcam to engage both projections whereby both .centers are retracted.

8. In a machine of the class described, the combination with twocenters, of a stock carrier to deliver separate pieces of stock to thecenters, and an actuator including an adjustable yielding connection formoving the stoclocarrier toward the centers.

9. In a device of the class described, the combination with two centersand a swinging stock-carrier movable toward and from the centers, of amovable positioning stop sustained by said carrier, and means to engagesaid stop during the movement of the carrier toward the centers therebyto swing said stop into inoperative position.

10. In a machine of the class described, the combination with twoopposed centers, one of which is a spring-actuatedlongitudinally-movable brad center, of a slidablymounted spring-actuatedtube in which said center is sustamed, said tube having at its end amain center to engage the end of the stock, a stock-carrier' to deliverpieces of stock to the oppositely-disposed centers, an actuatorincluding an adjustable connection for moving the stock-carrier towardthe centers, and a single spiral cam to withdraw both said brad centerand said main center when each piece of stock is fed thereto.

. 11. In a machine of the class described,y

the combination With two opposed centers, one of which is aspring-actuated longitudinally-movable brad center", of aslidablymounted spring-actuated tube in which said center is sustalned,said tube having at its end a main center to engage the end of thestock, a stock-carrier to deliver pieces of stock to theoppositely-disposed centers, an actuator including an adjustableconnection for moving the stock-carrier toward the centers, a singlespiral cam to Withdraw both said brad center and said main center wheneach piece of stock is fed thereto, and a cushion device to limit thespring-impelled movement of the main center at such times as a piece ofstock fails to be delivered to the machine.

In testimony whereof, I have signed my name to this specification, inthe presencel of two subscribing Wltnesses.

NATHANIEL II. SHAW.

Witnesses LOUIS C. SMITH, FREDERICK S. GREENLEAF.

